River crossed by Julius Caesar in 49 BC - and many politicians since (7)

I believe the answer is:

rubicon

(Other definitions for rubicon that I've seen before include "River crossed by Caesar - no turning back" , "cause of conflict when crossed" , "Italy/Gaul boundary" , "River crossed by Caesar in decisive move" , "Point of no return (which Caesar crossed in 49BC)" .)

I've seen this clue in The Guardian.

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